My own half-penny’s worth of experience here: I’ve never ever had anyone tell me they can’t hear me when I’m in a noisy environment (edit: while streaming a phone call)! However, once in a blue moon, I’ll have someone say “HELLO?!” and then hang up cuz I’m guessing they can’t hear me. I always chalked that up to some kind of T-Mobile issue or interference from wifi inside/outside our house.
Now I’m also intrigued about the issues others are having when their own “smart” aids are trying to do something that seems to interfere with the phone call. I’m certainly no acoustic engineer or electrician, but I have in the past turned down Noise Cancellation on my older Marvel aids. It seems they wanted to dampen ALL sound down (as others have observed here) so that both speech AND the ambient noise would be too low.
With my new Phonak Life aids, I have Noise Cancellation on as a default and NO issues so far at all. In fact, I find that they seem to know to put me into “Speech in LOUD Noise” when I’m in a noisy place automatically! I have a dedicated program to force my aids into this program, but I haven’t needed to use it yet. I’m almost glad I don’t have the Phonak app on my phone, cuz I’d tinker it to death just trying things out.